linux-kernel - Re: [PATCH 02/10] x86/hyper-v: Move hv_message

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Date:   Mon, 22 Feb 2021 11:19:33 +0800
From:   Boqun Feng <boqun.feng@...il.com>
To:     Michael Kelley <mikelley@...rosoft.com>
Cc:     sthemmin@...rosoft.com, kys@...rosoft.com, wei.liu@...nel.org,
        tglx@...utronix.de, mingo@...hat.com, bp@...en8.de, hpa@...or.com,
        daniel.lezcano@...aro.org, arnd@...db.de,
        linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org,
        x86@...nel.org, linux-arch@...r.kernel.org
Subject: Re: [PATCH 02/10] x86/hyper-v: Move hv_message_type to architecture
 neutral module

On Wed, Jan 27, 2021 at 12:23:37PM -0800, Michael Kelley wrote:
> The definition of enum hv_message_type includes arch neutral and
> x86/x64-specific values. Ideally there would be a way to put the
> arch neutral values in an arch neutral module, and the arch
> specific values in an arch specific module. But C doesn't provide
> a way to extend enum types. As a compromise, move the entire
> definition into an arch neutral module, to avoid duplicating the
> arch neutral values for x86/x64 and for ARM64.
> 
> No functional change.
> 
> Signed-off-by: Michael Kelley <mikelley@...rosoft.com>

Reviewed-by: Boqun Feng <boqun.feng@...il.com>

Regards,
Boqun

> ---
>  arch/x86/include/asm/hyperv-tlfs.h | 29 -----------------------------
>  include/asm-generic/hyperv-tlfs.h  | 35 +++++++++++++++++++++++++++++++++++
>  2 files changed, 35 insertions(+), 29 deletions(-)
> 
> diff --git a/arch/x86/include/asm/hyperv-tlfs.h b/arch/x86/include/asm/hyperv-tlfs.h
> index 6bf42ae..dd74066 100644
> --- a/arch/x86/include/asm/hyperv-tlfs.h
> +++ b/arch/x86/include/asm/hyperv-tlfs.h
> @@ -263,35 +263,6 @@ struct hv_tsc_emulation_status {
>  #define HV_X64_MSR_TSC_REFERENCE_ENABLE		0x00000001
>  #define HV_X64_MSR_TSC_REFERENCE_ADDRESS_SHIFT	12
>  
> -
> -/* Define hypervisor message types. */
> -enum hv_message_type {
> -	HVMSG_NONE			= 0x00000000,
> -
> -	/* Memory access messages. */
> -	HVMSG_UNMAPPED_GPA		= 0x80000000,
> -	HVMSG_GPA_INTERCEPT		= 0x80000001,
> -
> -	/* Timer notification messages. */
> -	HVMSG_TIMER_EXPIRED		= 0x80000010,
> -
> -	/* Error messages. */
> -	HVMSG_INVALID_VP_REGISTER_VALUE	= 0x80000020,
> -	HVMSG_UNRECOVERABLE_EXCEPTION	= 0x80000021,
> -	HVMSG_UNSUPPORTED_FEATURE	= 0x80000022,
> -
> -	/* Trace buffer complete messages. */
> -	HVMSG_EVENTLOG_BUFFERCOMPLETE	= 0x80000040,
> -
> -	/* Platform-specific processor intercept messages. */
> -	HVMSG_X64_IOPORT_INTERCEPT	= 0x80010000,
> -	HVMSG_X64_MSR_INTERCEPT		= 0x80010001,
> -	HVMSG_X64_CPUID_INTERCEPT	= 0x80010002,
> -	HVMSG_X64_EXCEPTION_INTERCEPT	= 0x80010003,
> -	HVMSG_X64_APIC_EOI		= 0x80010004,
> -	HVMSG_X64_LEGACY_FP_ERROR	= 0x80010005
> -};
> -
>  struct hv_nested_enlightenments_control {
>  	struct {
>  		__u32 directhypercall:1;
> diff --git a/include/asm-generic/hyperv-tlfs.h b/include/asm-generic/hyperv-tlfs.h
> index e73a118..d06f7b1 100644
> --- a/include/asm-generic/hyperv-tlfs.h
> +++ b/include/asm-generic/hyperv-tlfs.h
> @@ -213,6 +213,41 @@ enum HV_GENERIC_SET_FORMAT {
>  #define HV_MESSAGE_PAYLOAD_BYTE_COUNT	(240)
>  #define HV_MESSAGE_PAYLOAD_QWORD_COUNT	(30)
>  
> +/*
> + * Define hypervisor message types. Some of the message types
> + * are x86/x64 specific, but there's no good way to separate
> + * them out into the arch-specific version of hyperv-tlfs.h
> + * because C doesn't provide a way to extend enum types.
> + * Keeping them all in the arch neutral hyperv-tlfs.h seems
> + * the least messy compromise.
> + */
> +enum hv_message_type {
> +	HVMSG_NONE			= 0x00000000,
> +
> +	/* Memory access messages. */
> +	HVMSG_UNMAPPED_GPA		= 0x80000000,
> +	HVMSG_GPA_INTERCEPT		= 0x80000001,
> +
> +	/* Timer notification messages. */
> +	HVMSG_TIMER_EXPIRED		= 0x80000010,
> +
> +	/* Error messages. */
> +	HVMSG_INVALID_VP_REGISTER_VALUE	= 0x80000020,
> +	HVMSG_UNRECOVERABLE_EXCEPTION	= 0x80000021,
> +	HVMSG_UNSUPPORTED_FEATURE	= 0x80000022,
> +
> +	/* Trace buffer complete messages. */
> +	HVMSG_EVENTLOG_BUFFERCOMPLETE	= 0x80000040,
> +
> +	/* Platform-specific processor intercept messages. */
> +	HVMSG_X64_IOPORT_INTERCEPT	= 0x80010000,
> +	HVMSG_X64_MSR_INTERCEPT		= 0x80010001,
> +	HVMSG_X64_CPUID_INTERCEPT	= 0x80010002,
> +	HVMSG_X64_EXCEPTION_INTERCEPT	= 0x80010003,
> +	HVMSG_X64_APIC_EOI		= 0x80010004,
> +	HVMSG_X64_LEGACY_FP_ERROR	= 0x80010005
> +};
> +
>  /* Define synthetic interrupt controller message flags. */
>  union hv_message_flags {
>  	__u8 asu8;
> -- 
> 1.8.3.1
>